logstash-core/lib/logstash/compiler/lscl/lscl_grammar.rb [366:393]:
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    s0 << r1
    if r1
      r2 = _nt_cs
      s0 << r2
      if r2
        if (match_len = has_terminal?("{", false, index))
          r3 = true
          @index += match_len
        else
          terminal_parse_failure('"{"')
          r3 = nil
        end
        s0 << r3
        if r3
          r4 = _nt_cs
          s0 << r4
          if r4
            s5, i5 = [], index
            loop do
              i6, s6 = index, []
              r7 = _nt_branch_or_plugin
              s6 << r7
              if r7
                r8 = _nt_cs
                s6 << r8
              end
              if s6.last
                r6 = instantiate_node(SyntaxNode,input, i6...index, s6)
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logstash-core/lib/logstash/compiler/lscl/lscl_grammar.rb [2304:2331]:
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    s0 << r1
    if r1
      r2 = _nt_cs
      s0 << r2
      if r2
        if (match_len = has_terminal?("{", false, index))
          r3 = true
          @index += match_len
        else
          terminal_parse_failure('"{"')
          r3 = nil
        end
        s0 << r3
        if r3
          r4 = _nt_cs
          s0 << r4
          if r4
            s5, i5 = [], index
            loop do
              i6, s6 = index, []
              r7 = _nt_branch_or_plugin
              s6 << r7
              if r7
                r8 = _nt_cs
                s6 << r8
              end
              if s6.last
                r6 = instantiate_node(SyntaxNode,input, i6...index, s6)
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